Another USD 1.1 billion has been approved by the Indian government for augmenting the currency swap arrangement between the two Central Banks.
This additional amount is expected to be made available in due course, a central bank statement said here.
During Prime Minister Narendra Modi's visit to Sri Lanka last month, RBI agreed for a USD 1.5 billion currency swap agreement with the Sri Lankan central bank to help the island nation keep its currency stable.
The funds are from RBI's financing facility for South Asian Association for Regional Cooperation (SAARC) member country Central Banks.
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India has a Framework on Currency Swap Arrangement for SAARC Member countries since 2012.
The facility is available to all SAARC member countries with a floor of USD 100 million and ceiling of USD 400 million within overall limit of USD 2 billion and is valid till November 14, 2015.
Sri Lankan Central Bank's announcement for getting the first USD 400 million tranche from India came as the rating agency, Fitch warned last week that the island's economy was facing a weakening balance of payments.
Fitch said Sri Lanka's balance of payments were weak with debt repayments drawing down reserves to less than USD 7 billion by end-March 2015 from a peak of USD 10 billion in 2014, raising concerns.